Optimization of a QoS aware cross-layer scheduler by packet aggregation

Publikationstyp
Conference Paper
Publikationsdatum
2008-09
Sprache
English
Author
Konsgen, Andreas 
Islam, Md Shahidul 
Timm-Giel, Andreas orcid-logo
Görg, Carmelita 
TORE-URI
http://hdl.handle.net/11420/12075
First published in
IFIP International Federation for Information Processing 
Number in series
284
Start Page
149
End Page
160
Citation
IFIP International Federation for Information Processing 284: 149-160 (2008-09-11)
Contribution to Conference
10th International Conference on Mobile and Wireless Communication Networks, 2008 
Publisher DOI
10.1007/978-0-387-84839-6_12
Scopus ID
2-s2.0-51149109937
Publisher
Springer
In this paper, the performance of a QoS-aware two-stage cross-layer scheduler utilising a MIMO channel for transmission is considered along with TDMA, OFDMA and SDMA channel access methods which serves a number of users with QoS-constrained data flows. OFDMA and SDMA allow a parallel transmission of packets which can have different transmission durations due to varying physical bit rates and packet lengths. The data flow with the longest packet slows down the other flows because they have to wait until the transmission is complete. This paper proposes packet aggregation where waiting times are reduced by transmitting more than one packet per user if airtime is left. It is shown that this method significantly enhances the QoS parameters throughput and delay. For constant-size packets, shorter delays can be achieved than for variable-size packets. Aggregating non-consecutive packets further enhances the performance, however the packets have to be buffered at the receiver to put them into the correct order. © 2008 International Federation for Information Processing.
DDC Class
004: Informatik